In Shanghai in 1937, a series of "serial disappearances of women in red" occurred in the French Concession. The victims were all young women. Only a fog-patterned copper button was left at the scene of the disappearance.
Shen Yanci was ordered to investigate the case, but found that the case involved high-level concession officials, Japanese spies, cultural relic smuggling, human trafficking, and even the truth about the death of his parents ten years ago.
Female reporter Su Qinghuan went into dangerous situations to find out the truth. The two went from testing each other to fighting side by side. In the foggy murder case, they tore apart the darkness under the glitz of Shanghai. Finally, before the consequences came, they uncovered the true face of "Mr. Night Fog" and guarded the last justice and conscience.
